Benazepril is used alone or in combination with other medications to treat high blood pressure in adults and children at least 6 years old. Lowering blood pressure may lower your risk of a stroke or heart attack. Benazepril (Lotensin) is an oral medication used to treat high blood pressure. Learn about side effects, warnings, dosage, and more. Lowering blood pressure reduces the risk of strokes and heart attacks. Benazepril is an angiotensin converting enzyme (ACE) inhibitor. It works by blocking a substance in the body that causes blood vessels to tighten. As a result, benazepril relaxes the blood vessels. Find patient medical information for Benazepril (Lotensin) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Benazepril is used to treat patients with high blood pressure. Learn about side effects, drug interactions, dosages, warnings, and more. Benazepril is used alone or in combination with other medications to treat high blood pressure. Benazepril is in a class of medications called angiotensin-converting enzyme (ACE) inhibitors. It works by decreasing certain chemicals that tighten the blood vessels, so blood flows more smoothly. Benazepril, sold under the brand name Lotensin among others, is a medication used to treat high blood pressure, heart failure, and diabetic kidney disease. [2].